Free AV @home

For some time I've been using Grisoft's AVG Free version 6 for Home use only. I've just discovered an alternative, free for Home use, from Avast. Coincidentally?, both companies appear to be Czech. Anyone have any comments on the relative merits of these products?

I tried to install Avast anti virus on three systems and on two of them (running Win 98) it would not install. I have not encountered any problems installing AVG anti virus.The only problem I have had with AVG was that it missed a Worm (with the latest update at the time) that I had in a downloaded file. Trend Micro's free Housecall service picked up the worm and fixed the problem.

Having used AVG for over 4years I have no compaliants. I have seen Avast also recommended on this site and it sounds as if they both have their merits. Everyone will give their own views good and bad but my motto has been It works for me why change it